XLPE Cable Joint Research Articles

CVケーブル接続部欠陥の部分放電及び絶縁破壊特性

CVケーブル接続部欠陥の部分放電及び絶縁破壊特性

Conductor temperature monitoring system in underground power transmission XLPE cable joints

A conductor temperature monitoring system using the current method was developed to estimate conductor temperatures at joints of extra-high-voltage (EHV) underground power transmission XLPE cables in real time. The validity of the software and hardware was confirmed by measurements on an extrusion molded joint (EMJ) of a 275 kV 1*2500 mm/sup 2/ aluminum-sheathed XLPE cable. The mean circumferential jacket surface temperature over the EMJ, where the cross section was larger than that at the cable portion, was measured by a line thermosensor using thermocouples or a distributed temperature sensor using an optical fiber. The conductor temperature in the cable joint was estimated by numerically solving simultaneous differential equations with 31 unknowns. A system which allows measurement of the cable conductor current at insulation joints of installed lines was also developed. >

Water contamination in a cross-linked polyethylene cable joint

An analysis of splice failures on a cross-linked polyethylene (XLPE) insulated cable is performed with particular interest in the effects of contaminants and the adsorption of water on surface track resistance of the splice pencil. Many cable users do not give sufficient consideration to the hygroscopic nature of XLPE surfaces when developing splicing procedures. This paper examines some of the effects of water on XLPE cable joints and presents procedures to eliminate its detrimental effects.